The Telekom Account Management Portal is vulnerable to an authentication bypass flaw that permits attackers to circumvent multi-factor authentication through brute-force attacks.

This is an improper access control vulnerability resulting from a lack of rate-limiting on multi-factor authentication (MFA) requests. An unauthenticated attacker can perform unlimited brute-force attempts to guess MFA codes, leading to a full authentication bypass.

Successful exploitation grants an attacker full access to user accounts within the portal, leading to unauthorized data exposure, potential identity theft, and compromise of sensitive customer information. Given the CVSS score of 9.1, this vulnerability poses a critical risk to organizational data integrity and regulatory compliance.

Immediate Action: Upgrade to the patched version released on 2025-11-03 to ensure rate-limiting controls are active.

Proactive Monitoring: Review authentication logs for patterns of high-frequency failed MFA attempts originating from single or distributed IP addresses.

Compensating Controls: Implement stricter IP-based access controls and monitor for anomalous login traffic via a Web Application Firewall (WAF) until the update is applied.

Public Exploit Available: Unknown

This vulnerability represents a significant security failure in the authentication chain. Administrators must prioritize the application of the vendor-provided patch immediately to prevent unauthorized access and protect user credentials from brute-force compromise.